WO1998043693A1 - Catheter pourvu d'un mecanisme de detection d'obstacles - Google Patents

Catheter pourvu d'un mecanisme de detection d'obstacles Download PDF

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Publication number
WO1998043693A1
WO1998043693A1 PCT/JP1998/001248 JP9801248W WO9843693A1 WO 1998043693 A1 WO1998043693 A1 WO 1998043693A1 JP 9801248 W JP9801248 W JP 9801248W WO 9843693 A1 WO9843693 A1 WO 9843693A1
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WO
WIPO (PCT)
Prior art keywords
catheter
signal
sensor
output signal
threshold value
Prior art date
Application number
PCT/JP1998/001248
Other languages
English (en)
Japanese (ja)
Inventor
Fumihito Arai
Kouichi Itoigawa
Hitoshi Iwata
Original Assignee
Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho filed Critical Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho
Publication of WO1998043693A1 publication Critical patent/WO1998043693A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/03—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs
    • A61B5/036—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs by means introduced into body tracts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/74—Details of notification to user or communication with user or patient ; user input means
    • A61B5/7405—Details of notification to user or communication with user or patient ; user input means using sound
    • A61B5/7415—Sound rendering of measured values, e.g. by pitch or volume variation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M2025/0001—Catheters; Hollow probes for pressure measurement
    • A61M2025/0002—Catheters; Hollow probes for pressure measurement with a pressure sensor at the distal end
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
    • A61M25/0068—Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
    • A61M25/0068—Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
    • A61M25/0069—Tip not integral with tube
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
    • A61M25/0082—Catheter tip comprising a tool

Definitions

  • the present invention relates to a catheter with an obstacle sensing mechanism.
  • a catheter has been known as a kind of medical instrument that can be inserted into a body.
  • a catheter tube having a diameter of several mm or less, which constitutes a force catheter, is inserted into various kinds of tubes in a human body, such as blood vessels.
  • the tip of the catheter tube is guided to a desired site in the body, where a measurement operation (for example, blood pressure measurement) and a treatment operation (for example, blood vessel dilation) are performed. For this reason, the catheter operator must reliably guide the tip of the catheter tube to the desired site by external operation.
  • a measurement operation for example, blood pressure measurement
  • a treatment operation for example, blood vessel dilation
  • a catheter having an obstacle sensing mechanism has, for example, the following configuration.
  • a pressure barrier is provided on the inner wall surface of the distal end portion of the catheter tube.
  • the pressure barrier defines a chip chamber inside the tube.
  • a semiconductor pressure sensor chip is housed in the tube housing chamber while mounted on a substrate.
  • the chip receiving chamber is filled with, for example, silicone gel as a pressure transmitting medium.
  • the opening of the catheter tube is sealed by a piston. Therefore, in this catheter, the outer surface of the piston functions as the pressure receiving surface at the tip.
  • the sensor chip outputs an electric signal corresponding to a change in pressure to the outside as a sensor output signal.
  • the sensor output signal is amplified, A / D converted, and finally displayed as a graph on the CRT screen.
  • the operator can visually recognize the presence or absence of obstacles. More specifically, the appearance of an increase point on the line segment shown in the graph indicates that the touch pressure level has increased, thereby recognizing the presence of an obstacle.
  • it is not possible to constantly monitor the CRT screen during the actual operation. In other words, you need to check the situation at hand and check the radiographic image to determine the position of the catheter inside the body.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a catheter with an obstacle sensing mechanism capable of reliably recognizing an increase in a contact pressure level. Disclosure of the invention
  • the contact pressure of a sensor unit provided at the tip of the catheter tube is detected by a pressure-sensitive sensor provided in the sensor unit, and A catheter that senses the presence or absence of an obstacle ahead in the traveling direction based on the sensor output from the pressure-sensitive sensor;
  • the gist of the present invention is a catheter with an obstacle sensing mechanism, which is provided with a signal auditory means for converting a change into a sound and hearing it.
  • the contact pressure of the sensor section provided at the tip of the catheter tube is detected by the pressure sensor provided in the sensor section, and the traveling direction is determined based on the sensor output signal from the pressure sensor.
  • a catheter for sensing the presence or absence of an obstacle in front of the catheter comprising: display means for visualizing a change in the sensor output signal; and signal auditory means for converting the change in the sensor output signal into a sound for hearing.
  • the gist of the invention is a catheter with an obstacle sensing mechanism.
  • the signal auralization means determines a magnitude of the signal by comparing the sensor output signal with a predetermined threshold value.
  • Means for changing the mode of the sound generated by the signal hearing aid means when the sensor output signal is equal to or less than the threshold value and when the sensor output signal exceeds the threshold value. It is said that it has.
  • the voice mode changing means rapidly changes the voice mode before and after a threshold value.
  • the signal auditory means includes: an audio signal generator that generates an audio signal; and an audio signal generator that generates a plurality of types of audio signals. And a sound signal selecting means for selecting a specific combination from the plurality of kinds of sound signals.
  • the signal-hearing unit includes a threshold value changing unit configured to change the threshold value to be compared with the sensor output signal. I was prepared.
  • the sensor section when the sensor section provided at the distal end of the catheter tube comes into contact with an obstacle located forward in the forward direction, the sensor section receives pressure from the obstacle.
  • the pressure increase at that time is detected by the pressure sensor and Then, it is output to the signal auditory means as a sensor output signal.
  • the change in the sensor output signal is converted into sound and is audible. Therefore, even during the actual operation, the operator of the catheter can easily and reliably recognize the increase in the contact pressure level through hearing. Therefore, it is possible to provide convenience in a case where the user cannot keep his / her eyes away from his / her hand during the operation.
  • the sensor when the sensor provided at the distal end of the catheter tube comes into contact with an obstacle located forward in the traveling direction, the sensor receives pressure from the obstacle.
  • the increase in pressure at that time is detected by the pressure-sensitive sensor, and is output to the signal auditory means and the display means as a sensor output signal.
  • the change in the sensor output signal is not only visualized as, for example, a graph or the like, but also converted into voice so as to be audible.
  • the catheter operator can more easily and reliably recognize the increase in tactile level through two of the five senses: visual and auditory. Therefore, in a case where the user cannot keep an eye on his / her hand or the like during the operation, such convenience can be achieved at any time.
  • the signal comparison and determination means compares the sensor output signal with a predetermined threshold, thereby determining the magnitude of both.
  • the voice mode changing means changes the mode of the voice generated by the signal auditory means between when the sensor output signal is equal to or less than the threshold value and when the sensor output signal exceeds the threshold value based on the determination result. I do. Therefore, if this threshold value is set in advance to the permissible limit of the contact pressure level, it is possible to reliably recognize that the catheter operation has reached this value with a change in the voice mode.
  • the audio signal generator when a specific combination is selected from a plurality of types of audio signals by the audio signal selecting means, the audio signal generator operates according to the control program stored in the storage means. The audio signal of the selected combination appear. Therefore, it is possible to select an optimal combination of voice modes used before and after the threshold value according to the surrounding situation.
  • the threshold value can be changed by operating the threshold value changing means, so that the threshold value is set and adjusted in advance to a permissible limit value of the contact pressure level according to the application. can do.
  • (a) is a cross-sectional view of the distal end portion of the catheter main body in the catheter with an obstacle sensing mechanism according to one embodiment of the present invention.
  • (b) is a sectional view taken along line A-A of (a).
  • (c) is a BB sectional view of (a).
  • FIG. 2 is a block diagram of the control system.
  • 5 is a flowchart showing the signal processing operation.
  • This catheter with an obstacle sensing mechanism is for introducing a blood vessel, and includes a catheter body 1 and a control system 31 for controlling the catheter body.
  • the catheter body 1 is provided at the proximal end of the catheter tube (made of polyvinyl chloride, 1.6 mm in diameter in this embodiment) 2 to be inserted into a blood vessel 27 and for operating the catheter outside the body.
  • Operating means (not shown).
  • the operation means includes, for example, a plurality of wires inserted into the tube 2 and a wire operation unit for operating the wires.
  • a syringe (not shown) for pumping a liquid such as a drug solution or a contrast agent is connected to the distal end side of the tube 2 at the proximal end 2 of the tube 2.
  • a sensor assembly 3 as a sensor unit formed separately from the catheter tube is attached to the distal end side of the catheter tube 2.
  • the sensor assembly 3 includes an outer tube 4 and an inner tube 5.
  • the distal end side of the outer tube member 4 is a large-diameter portion 4a having an outer diameter substantially equal to the outer diameter of the catheter tube 2.
  • the proximal end of the outer tube 4 is a small-diameter portion 4b having a smaller outer diameter than the large-diameter portion 4a.
  • the small diameter portion 4 b is a portion that is fitted to the distal end opening of the catheter tube 2. Therefore, a plurality of retaining grooves 6 extending in the circumferential direction are formed on the outer peripheral surface.
  • a piston 7 as a pressure receiving body is fitted to the distal end side opening of the outer tube 4 so as to be movable along the longitudinal direction of the tube 2. Further, a joint portion between the piston 7 and the outer tube 4 is sealed with a sealing material 8.
  • the inner tube member 5 which is an inner tube member, is a tubular member having a smaller outer diameter and a shorter length than the outer tube 4.
  • the inner tube 5 is non-slidably fitted into the inner tube 4.
  • a notch 9 is formed at one end of the inner tube 5 protruding inside the large diameter portion 4a.
  • a pedestal 11 is joined to the inner wall surface of the cutout 9 with an adhesive A1.
  • a semiconductor type pressure sensor chip 10 as a pressure-sensitive sensor is mounted on the pedestal 11.
  • the bonding agent A1 is a hardened material.
  • the bonding agent A1 is a) composed of an insulating material, b) rigid, c) biocompatible It is most desirable to meet all three requirements, consisting of compatible materials. In view of such circumstances, in the present embodiment, a thermosetting resin such as an epoxy resin is used. Epoxy resin satisfies all three requirements.
  • a back pressure chamber 19 may be formed between the upper surface of the pedestal 11 and the lower surface of the sensor chip 10 as shown in FIG. Further, the back pressure chamber 19 may be communicated with the relative pressure region via a back pressure hole (not shown) formed in the pedestal 11.
  • the semiconductor pressure sensor chip 10 has a thin portion at the center.
  • a strain gauge 12 is formed on the upper surface of the thin portion.
  • a plurality of bonding pads are formed on the upper surface of the sensor chip 10. These bonding pads are electrically connected to relay pads 14 of the flat cable 13 via bonding wires 15. This flat cable 13 passes through the inside of the catheter tube 2 and reaches the base end of the tube 2.
  • the bonding material A 1 seals a gap between the lower surface and the side surface of the pedestal 11 and the inner wall surface of the notch 9 of the inner tube 5.
  • the pedestal 11 is fixed to the inner tube 5.
  • the bonding material A 1 also wraps around upward, and seals the through hole of the inner tube 5 in a non-penetrating state. Therefore, a pressure barrier 16 is formed in the inner tube 5 at a position slightly closer to the base end than the notch 9. The pressure barrier 16 entirely seals the bonding wire 15 drawn from the sensor chip 10.
  • the medium barrier space 17 is defined in the outer tube 4 by the pressure barrier 16.
  • the medium accommodating space 17 is filled with a silicone gel 18 as a pressure transmission medium.
  • the pressure barrier 16 serves to prevent the silicone gel 18 from flowing toward the proximal end of the tube 2.
  • a separation wall 21 exists inside the catheter tube 2.
  • the separation wall 21 extends along the axial direction of the tube 2. To divide the interior into two regions.
  • the separation wall 21 separates a signal line lumen 22 and a liquid distribution lumen 23. Both lumens 22 and 23 are semicircular in cross section.
  • a flat cable 13 is accommodated in the signal line lumen 22.
  • a liquid medicine, a contrast agent, and the like can be distributed.
  • the reason for supplying the contrast agent is to grasp the position of the sensor assembly 3 in more detail by imaging the blood vessel.
  • the drug solution include a thrombolytic agent.
  • the catheter tube 2 has a liquid discharge port 24 as an opening on the outer peripheral surface thereof.
  • the liquid discharge port 24 communicates the inside and outside of the liquid distribution lumen 23. Therefore, the liquid supplied from the base end side of the tube 2 is discharged from the outer peripheral surface side of the tube 2 through the liquid discharge port 24 and supplied to the affected part.
  • the catheter tube 2 has a distal end sealing body 25.
  • the distal end sealing body 25 is made of a biocompatible material (for example, epoxy resin or the like), and seals only the liquid flow lumen 23 among the two lumens 22 and 23 at the distal end.
  • the distal end sealing body 25 is located near the position where the liquid discharge port 24 is formed, and is located on the distal end side of the tube 2 therefrom.
  • a liquid guide slope 25 a is provided on the base end side of the distal end sealing body 25.
  • the liquid guide slope 25 a is located inside the lumen 23 and near the liquid discharge port 24. In FIG. 1 (a), the liquid guide slope 25a is located almost directly below the liquid discharge port 24.
  • the biston 7 on the head of the sensor assembly 3 It receives pressure from the obstacle. Then, the increase in the pressure at that time is transmitted to the sensor chip 10 which is the pressure receiving surface via the silicone gel 18, causing a change in the resistance value of the strain gauge 12 there. As a result, the sensor chip 10 transmits an electric signal (that is, the sensor output signal SS 1) corresponding to the pressure change to the wire bonding 15, the relay tab 14, and the flat plate. Output is provided to the control system 31 via the cable 13.
  • an obstacle for example, a blood vessel 27 branch site as shown in FIG. 2
  • FIG. 2 is a block diagram of a control system 31 for controlling the catheter body 1.
  • the control system 31 of the present embodiment includes an amplifier 32 for amplifying a sensor output signal, an A / D converter 33, a control computer 34, a CRT 35, an amplifier 36 for amplifying an audio signal, a speaker 37, and a mode selection switch 38.
  • the control computer 34 includes a CPU 41, a memory 42, an input / output interface 43, and an audio signal generator 44.
  • the flat cable 13 drawn from the sensor assembly 3 of the main body 1 of the catheter is passed through the sensor output signal amplification amplifier 32 and the A / D converter 33 to the I / O interface of the control unit 34. It is electrically connected to Face 43. Accordingly, the analog sensor output signal S S1 from the semiconductor pressure sensor chip 10 is amplified by the amplifier 32. The amplified sensor output signal S S1 is digitized by the A / D converter 33 and then taken into the control console 34.
  • a CRT 35 is electrically connected to an I / O interface 43 of the control computer 34, and a speaker 37 is electrically connected to the I / O interface 43 via an amplifier 36 for amplifying an audio signal.
  • the CRT 35 visualizes the signal output from the control computer 34 as a graph.
  • the amplifier 36 amplifies the audio signals AS1 to ASn output from the control computer 34, and the speaker 37 converts the amplified audio signals AS1 to ASn into audio by converting them into audio.
  • the display means is constituted by the amplifier 32 for amplifying the sensor output signal, the 8/0 converter 33, the control computer 34, and the CRT 35.
  • a signal auralizing means 45 is constituted by the amplifier 32 for amplifying the sensor output signal, the octave converter 33, the control computer 34, the amplifier 36 for amplifying the audio signal, and the speaker 37.
  • the CPU 41 constituting the control computer 34 compares the sensor output signal SS1 with a predetermined threshold value Vthh based on a predetermined program. Is used to determine the magnitude. Further, the CPU 41 changes the sound mode of the speaker when SS 1 ⁇ Vth and when SS 1> Vth. That is, the CPU 41 is a signal comparison / determination unit and a voice mode change unit.
  • the audio signal generator 44 is, for example, a conventionally known synthesizer or oscillation circuit, and plays a role of generating a plurality of types of audio signals.
  • a voice generation program for causing the voice signal generator 44 to generate a plurality of types of voice signals AS1 to ASn is stored in the memory 42 in advance.
  • a mode selection switch 38 as an audio mode selection means is further electrically connected to the I / O interface 43 of the control computer 34. Therefore, the switch signal generated by the mode selection switch 38 is taken into the CPU 41 via the I / O interface 43. As a result, the CPU 41 selects a specific combination, for example, AS1 and AS2, from a plurality of types of audio signals AS1 to ASn based on the switch signal. Then, of the two selected audio signals AS K AS 2, one AS 1 is assigned to the audio to be used when SS 1 ⁇ V th, and the other AS 2 is assigned as SS 1> V th Assigned to the audio to be used. Then, the CPU 41 outputs the audio signal AS thus selected.
  • the second voice When the first voice is compared with the second voice, it is desirable that the second voice can relatively draw the attention of the operating person. Therefore, for example, when the first voice is a continuous dial tone of “P”, the second voice is preferably a continuous dial tone of “B”. This is because the latter is a muddy tone compared to the clear tone, and is generally considered to be able to draw attention.
  • the first timbre is a low tone
  • the second sound may be a relatively high tone.
  • the volume of the second sound is set at a predetermined position, the second sound may be set relatively higher. If the sound quality of the first sound is set to soft, the second sound May be set to be harder than that.
  • the second sound may be an intermittent sound shorter than the intermittent sound. If the first is a constant rhythm, the rhythm of the second voice may be irregular and irregular. The modulation may not be applied to the first sound, but may be applied only to the second sound. This is because the latter is generally considered to be more alert than the former.
  • the voice mode is changed abruptly (or discontinuously) before and after the threshold value Vth.
  • the catheter operator's attention can be more reliably called as compared to the case where the voice mode is changed slowly (or continuously).
  • step S1 the CPU 41 inputs the digitally converted sensor output signal S S1 via the I / O interface 43. Thereafter, the CPU 41 proceeds to the next step S2.
  • step S2 the CPU 41 calls up the data relating to the threshold value Vth stored in the memory 42, compares it with the sensor output signal S S1, and determines the magnitude thereof. If it is determined that S S l ⁇ Vth, that is, if the threshold value is not exceeded, the CPU 41 proceeds to the next step S3. If S S 1> V th, that is, if it is determined that the threshold is exceeded, the CPU 41 shifts to step S8 without shifting to the next step S3.
  • step S3 the CPU 41 proceeds to the next step S4 without changing the audio signal. Specifically, the audio signal AS1 corresponding to the first audio is held as it is. Conversely, in step S8, the CPU 41 calls up a predetermined program from the memory 42, and changes the audio signal based thereon. Specifically, the audio signal AS 1 corresponding to the first audio is converted to the audio signal AS corresponding to the second audio.
  • step S8 the CPU 41 proceeds to step S4 I do.
  • step S4 the CPU 41 causes the audio signal generator 44 to generate one of the audio signals AS1 and AS2 according to the audio generation program. Thereafter, the CPU 41 proceeds to the next step S5.
  • step S5 the CPU 41 outputs one of the obtained audio signals AS1 and AS2 to the speed 37 via the I / O interface 43 and the amplifier 36. As a result, the audio signals AS 1 and AS 2 are converted into air vibrations and are audible. Thereafter, the CPU 41 proceeds to the next step S6.
  • step S6 the CPU 41 determines whether or not to change the combination of voice mode selections based on the presence or absence of a switch signal from the mode selection switch. If the determination is NO, the CPU 41 proceeds to the next step S7. If the determination result is YES, the CPU 41 shifts to step S9 without shifting to the next step S7.
  • step S7 the CPU 41 maintains the current combination of audio mode selections.
  • step S9 the CPU 41 changes the combination of voice mode selections to another one based on the switch signal from the mode selection switch 38. That is, the combination of AS1 and AS2 at the present time is changed to, for example, a combination of AS1 and AS3, a combination of AS2 and AS3, and a combination of AS4 and AS5.
  • the sensor output signal SS 1 is compared with a predetermined threshold value V th by the CPU 41, which is the signal comparison / judgment means 45, whereby both SS 1 and V 1 The magnitude of th is determined.
  • the CPU 41 which is also a voice mode changing means, further changes the voice mode between S S l ⁇ V th and when S S I> V th based on the determination result. Therefore, if this threshold value Vth is set in advance to the allowable limit value of the contact pressure level, the catheter operator can reliably recognize that the threshold value has been reached by changing the voice mode. That is, in the case of this vascular catheter, the threshold value Vth may be set in advance so as to be smaller than the contact pressure level that may damage the blood vessel 27.
  • the voice mode is rapidly changed around the threshold value Vth. Therefore, it is possible to more reliably recognize that the tactile pressure level has reached the threshold value Vth during the operation of the catheter as compared to a case where the voice mode is temporarily changed slowly.
  • a specific combination is selected from a plurality of types of audio signals AS 1 to ASn by the mode selection switch 38. Then, according to the control program stored in the memory 42, the audio signal generator '44 generates an audio signal of the selected combination, for example, AS1 and AS2. Therefore, it is used before and after the threshold value Vth according to the surrounding situation in the operating room. The most suitable combination of audio modes can be selected.
  • a sound mode that can be clearly distinguished from the sound emitted by the device can be selected. Therefore, it is possible to avoid misrecognition and confusion with the sound emitted from the device.
  • the configuration of the signal auditory means 52 is slightly different. That is, the signal auralization means 52 further includes a threshold value change switch 53 as a threshold value change means for changing the threshold value Vth to be compared with the sensor output signal SS1. I have. Therefore, by operating the threshold value change switch 53, the threshold value Vth can be increased or decreased to an arbitrary value within a predetermined range. For this reason, the threshold value V th can be set and adjusted in advance to the allowable limit value of the contact pressure level according to the application.
  • a siren 63 is used instead of the speaker 37 constituting a part of the signal auditory means 62.
  • the mode selection switch 38 and the threshold value change switch 53 are omitted.
  • the configuration can be simplified.
  • the signal processing may be performed by an analog circuit without changing the analog signal.
  • the sensor assembly 3 as the sensor section is not necessarily limited to the one exemplified in the embodiment, and may have a different structure.
  • the audio signal generator 44 described in the embodiment may be a device that samples a voice such as a human language.
  • the configuration of the embodiment or another example is superior in that not only the auditory sense but also the conventional visual sense can be sensed.
  • the catheter body 1 of the catheter of the present invention may be of course used for insertion into a vessel other than the blood vessel 27 in the body (eg, bronchi, digestive tract, lymphatic vessel, urethra, etc.).
  • a vessel other than the blood vessel 27 in the body eg, bronchi, digestive tract, lymphatic vessel, urethra, etc.
  • the second voice used when the threshold is exceeded is a continuous dial tone
  • the first voice used when the threshold is equal to or lower than the threshold is an intermittent dial tone.
  • the second voice used when exceeding the threshold is an intermittent dial tone
  • the first voice used when the threshold is equal to or lower than the threshold is a continuous dial tone.
  • the second voice used when the threshold value is exceeded is a muddy tone
  • the first voice used when the threshold value is less than the threshold value is relatively clear.
  • the sound quality of the second voice used when the threshold value is exceeded is set to be hard, and the first voice used when the threshold value is equal to or less than the threshold value is relatively softened.
  • a catheter with an obstacle sensing mechanism characterized in that: With this configuration, when the contact pressure level reaches the threshold value, the operator's attention can be surely attracted.
  • the second voice used when the threshold value is exceeded is set to a short interrupted sound with a short intermittent interval, and the first voice used when the threshold value is equal to or less than the threshold value is relatively determined.
  • the contact pressure of the sensor section provided at the tip of the catheter tube is detected by the pressure sensor provided in the sensor section, and the obstacle in front of the traveling direction is detected based on the sensor output signal from the pressure sensor.
  • a change in the sensor output signal is converted into sound and converted into an auditory signal to notify the operator of the presence of an obstacle through an auditory sense. Obstacle notification method. With this method, the operator can surely recognize the increase in the contact pressure level.
  • the contact pressure of the sensor section provided at the tip of the catheter tube is detected by the pressure sensor provided in the sensor section, and an obstacle in front of the traveling direction is detected based on a sensor output signal from the pressure sensor.
  • the change in the sensor output signal is converted into a sound to be auditory, so that it is possible to determine that there is an obstacle.
  • a method of notifying an obstacle in a catheter characterized in that the notification is made visually and aurally overnight. In this way, the operator is more likely to increase the tactile level. It can be surely recognized.
  • Biocompatible material A material that has low reactivity with blood, body fluids, lymph, and other biological substances.
  • silicone resin epoxy resin
  • resins such as polyvinyl chloride
  • metals such as stainless steel and gold
  • alumina ⁇ ⁇ ⁇
  • ceramics such as zirconia.
  • the threshold value can be set and adjusted in advance to the allowable limit value of the contact pressure level depending on the application.

Abstract

L'invention concerne un cathéter pourvu d'un mécanisme de détection d'obstacles permettant d'augmenter la sensibilité tactile afin de reconnaître les obstacles sans erreur. Le cathéter détecte l'effleurement d'un obstacle au moyen d'une partie de détection (3) placée à l'extrémité du tube (2) de cathéter ladite partie de détection (3) comportant un capteur (10) de pression. La présence ou l'absence d'un obstacle (28) sur la trajectoire de déplacement du cathéter est donc captée sous forme de signal (SS1) émis par le capteur (10) de pression. Une modification du signal (SS1) de sortie du capteur est transformée en signal sonore au moyen d'un organe (45) destiné à rendre les signaux audibles.
PCT/JP1998/001248 1997-03-27 1998-03-20 Catheter pourvu d'un mecanisme de detection d'obstacles WO1998043693A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9075492A JPH10263089A (ja) 1997-03-27 1997-03-27 障害物感知機構付きカテーテル
JP9/75492 1997-03-27

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Publication Number Publication Date
WO1998043693A1 true WO1998043693A1 (fr) 1998-10-08

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PCT/JP1998/001248 WO1998043693A1 (fr) 1997-03-27 1998-03-20 Catheter pourvu d'un mecanisme de detection d'obstacles

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JP (1) JPH10263089A (fr)
WO (1) WO1998043693A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001049227A1 (fr) * 2000-01-03 2001-07-12 Johns Hopkins University Dispositifs chirurgicaux et methodes d'utilisation garantissant une perception tactile accrue
WO2004067053A2 (fr) * 2003-01-28 2004-08-12 Technische Universität Darmstadt Systeme de technique medicale muni d'un dispositif oblong

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JP4878513B2 (ja) 2006-03-27 2012-02-15 国立大学法人 名古屋工業大学 可撓性線状体の圧縮力計測装置および方法
JP4878526B2 (ja) 2006-09-05 2012-02-15 国立大学法人 名古屋工業大学 可撓性線状体の圧縮力計測装置
US20100234873A1 (en) 2007-11-27 2010-09-16 Yoshitaka Nagano Drive device, and medical apparatus and training apparatus including the same
JP5171535B2 (ja) 2007-12-14 2013-03-27 Ｎｔｎ株式会社 荷重検出装置および荷重検出方法
US20120174686A1 (en) 2009-09-15 2012-07-12 Hideo Fujimoto Measurement device, medical device, training device, and measurement method
US20120203168A1 (en) 2009-10-14 2012-08-09 Hideo Fujimoto Insertion device, training device, and recording system
JP2014077691A (ja) 2012-10-10 2014-05-01 Ntn Corp 測定器の校正装置および校正方法

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JPH07204278A (ja) * 1994-01-17 1995-08-08 Mitsubishi Cable Ind Ltd 触覚センサおよびそれを取着してなる体内挿入用医療器具

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001049227A1 (fr) * 2000-01-03 2001-07-12 Johns Hopkins University Dispositifs chirurgicaux et methodes d'utilisation garantissant une perception tactile accrue
US6969384B2 (en) 2000-01-03 2005-11-29 The Johns Hopkins University Surgical devices and methods of use thereof for enhanced tactile perception
WO2004067053A2 (fr) * 2003-01-28 2004-08-12 Technische Universität Darmstadt Systeme de technique medicale muni d'un dispositif oblong
WO2004067053A3 (fr) * 2003-01-28 2009-03-12 Univ Darmstadt Tech Systeme de technique medicale muni d'un dispositif oblong

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